在几个类型的统一注入相同的DataContext实例 [英] Inject same DataContext instance across several types with Unity

问题描述

假设我有IRepository接口及其实现SqlRepository这需要作为一个参数的LINQ to SQL的DataContext。假设还有，我有IService接口及其实现服务的需要三个IRepository，IRepository和IRepository。演示代码如下：

Suppose I have IRepository interface and its implementation SqlRepository that takes as an argument LINQ to SQL DataContext. Suppose as well that I have IService interface and its implementation Services that takes three IRepository, IRepository and IRepository. Demo code is below:

public interface IRepository<T> { }

public class SqlRepository<T> : IRepository<T>
{
    public SqlRepository(DataContext dc) { ... }
}

public interface IService<T> { }

public class Service<T,T1,T2,T3> : IService<T>
{
    public Service(IRepository<T1> r1, IRepository<T2>, IRepository<T3>) { ... }
}

这是任何方式，同时创造服务类具有相同的DataContext注入三个库？

Is it any way while creating Service class to inject all three repositories with the same DataContext?

推荐答案

所有你需要做的就是确保当你用统一的容器使用登记的DataContext 的 PerResolveLifetimeManager 无论是在配置：

All you need to do is make sure when you register the Datacontext with your Unity container use the PerResolveLifetimeManager either in config:

<type type="<namespace>.DataContext, <assembly>">
    <lifetime type="Microsoft.Practices.Unity.PerResolveLifetimeManager, Microsoft.Practices.Unity" />
</type>

或代码：

container.RegisterType<DataContext>(new PerResolveLifetimeManager());

然后依赖这也需要一个的DataContext 将提供完全一样的。但接下来的请求来解析服务将创建一个新的的DataContext 。

then whenever the container resolves the Service any dependencies which also require a DataContext will be provided with exactly the same one. But the next request to resolve Service will create a new DataContext.

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